21034054453 has 4 divisors (see below), whose sum is σ = 21094324300. Its totient is φ = 20973784608.

The previous prime is 21034054441. The next prime is 21034054501. The reversal of 21034054453 is 35445043012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18494096049 + 2539958404 = 135993^2 + 50398^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034054453 - 2⁵ = 21034054421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034052453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30134400 + ... + 30135097.

It is an arithmetic number, because the mean of its divisors is an integer number (5273581075).

Almost surely, 2^21034054453 is an apocalyptic number.

It is an amenable number.

21034054453 is a deficient number, since it is larger than the sum of its proper divisors (60269847).

21034054453 is an equidigital number, since it uses as much as digits as its factorization.

21034054453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60269846.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 21034054453 its reverse (35445043012), we get a palindrome (56479097465).

The spelling of 21034054453 in words is "twenty-one billion, thirty-four million, fifty-four thousand, four hundred fifty-three".